I am going to gather together here most (maybe all) of the formulas I have seen to figure out the dose strength of the medicines I have made. We cannot always pay to have our product tested. I pick the strain that I am going to use for the next year of medicine making to have tested. I hopefully at least know what I have started with. I take no credit for these formulas and trust that some might just know what they are doing. It happens that the last two years my chosen strains have tested at 23.5 per cent THC. Either we are consistent growers or the labs are just pulling a fast one on me.

THC content in edibles is measured in milligrams, which is a measure of weight. So if you have a half-ounce of marijuana flower, all you need to do is find the THC percentage and convert accordingly. Remember, homegrown stuff is a little harder to estimate, and although dispensaries put flower THC percentages on packaging, they’re not always as high as advertised. Assuming you have a decent estimate of your THC percentage, though, it’ll just take some basic math.

To make this easy, let’s say your half-ounce of flower tested at 20 percent THC. An ounce equals 28,349.5 milligrams, so half an ounce would be 14,174.75 milligrams — and the THC would account for 20 percent of that. If you extract all of the THC out of the flower while making some pot butter, then you should get around 2,835 milligrams of THC. How much butter you want to cook with in order to spread out all that THC is up to you. As far as personal use goes, consider that Colorado law limits recreational edibles packaging to doses of 10 milligrams or less.

I asked for a formula to figure out what each of my mini cupcakes would actually have in THC. I got this answer from Michael McCord: (Grams of concentrate starting) X 1000 = weight of starting concentrates in milligrams(Weight of starting concentrates in mg / # of edibles at the end of baking process ) X .75 (unless you know the actual % THC content your oil has, then insert that here) = Final mg / treat. ​

IWith a strain called Afghan Goo it's about 18% THC. I was able to extract 7mL/grams so that equates to approximately 720mg of THC per 1mL/gram

Some comments from the Magical Butter page on Facebook: Vance Grossie oil is measured by volume not weight..get a numbered syringe..

Justin Hephner yea Vance is right, liquids are measured by volume, not weight, in this case you would be measuring mililiters, not grams. With water the conversion is 1-1 , IE 1 milliliter of water is = to 1 gram of weight, but with oil the density is higher. When dosing with oil, you will almost always be dealing with milligrams ofweight and milliliters of volume.